.box1 {
  width: 100px;
  height: 100px;
  background-image:url("../image/image.png");
}
.box2 {
  width: 100px;
  height: 100px;
  background-image:url("../image/image1.png");
}
.box3 {
  width: 100px;
  height: 100px;
  background-image:url("../image/image2.png");
}
.box4 {
  width: 100px;
  height: 100px;
  background-image:url("../image/image3.png");
}